package com.atguigu.chapter07.state;

import com.atguigu.bean.WaterSensor;
import org.apache.flink.api.common.functions.ReduceFunction;
import org.apache.flink.api.common.state.ReducingState;
import org.apache.flink.api.common.state.ReducingStateDescriptor;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;

/**
 * @Author lizhenchao@atguigu.cn
 * @Date 2021/7/20 11:40
 */
public class Flink06_State_KV_Reduce {
    
    public static void main(String[] args) {
        Configuration conf = new Configuration();
        conf.setInteger("rest.port", 20000);
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(conf);
        env.setParallelism(2);
        env
            .socketTextStream("hadoop162", 9999)
            .map(value -> {
                String[] datas = value.split(",");
                return new WaterSensor(datas[0], Long.valueOf(datas[1]), Integer.valueOf(datas[2]));
                
            })
            .keyBy(WaterSensor::getId)
            .process(new KeyedProcessFunction<String, WaterSensor, String>() {
    
                private ReducingState<WaterSensor> sumVcState;
    
                @Override
                public void open(Configuration parameters) throws Exception {
                    sumVcState = getRuntimeContext().getReducingState(new ReducingStateDescriptor<WaterSensor>(
                        "sumVcState",
                        new ReduceFunction<WaterSensor>() {
                            @Override
                            public WaterSensor reduce(WaterSensor value1, WaterSensor value2) throws Exception {
                                value1.setVc(value1.getVc() + value2.getVc());
                                return value1;
                            }
                        },
                        WaterSensor.class
                    ));
                }
                
                @Override
                public void processElement(WaterSensor value,
                                           Context ctx,
                                           Collector<String> out) throws Exception {
                    sumVcState.add(value);
    
                    out.collect(ctx.getCurrentKey() + "的水位和是: " + sumVcState.get().getVc());
    
                }
            })
            .print();
        
        try {
            env.execute();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
}

